Fixed Unnecessary default_values

Contributes to CURA-11575

resources/definitions/elegoo_neptune_4.def.json

@@ -11,7 +11,6 @@
     {
         "acceleration_print":
         {
-            "default_value": 10000,
             "maximum_value_warning": "20000",
             "value": 10000
         },

resources/definitions/elegoo_neptune_4max.def.json

@@ -18,7 +18,6 @@
     {
         "acceleration_print":
         {
-            "default_value": 2500,
             "maximum_value_warning": "15000",
             "value": 2500
         },

resources/definitions/elegoo_neptune_4plus.def.json

@@ -18,7 +18,6 @@
     {
         "acceleration_print":
         {
-            "default_value": 4000,
             "value": 4000
         },
         "machine_acceleration": { "value": 4000 },